forked from OSchip/llvm-project
620 lines
19 KiB
C++
620 lines
19 KiB
C++
// RUN: %clang_cc1 -analyze -analyzer-checker=alpha.cplusplus.MisusedMovedObject -std=c++11 -verify -analyzer-output=text %s
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namespace std {
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template <typename>
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struct remove_reference;
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template <typename _Tp>
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struct remove_reference { typedef _Tp type; };
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template <typename _Tp>
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struct remove_reference<_Tp &> { typedef _Tp type; };
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template <typename _Tp>
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struct remove_reference<_Tp &&> { typedef _Tp type; };
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template <typename _Tp>
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typename remove_reference<_Tp>::type &&move(_Tp &&__t) {
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return static_cast<typename remove_reference<_Tp>::type &&>(__t);
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}
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template <typename _Tp>
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_Tp &&forward(typename remove_reference<_Tp>::type &__t) noexcept {
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return static_cast<_Tp &&>(__t);
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}
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template <class T>
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void swap(T &a, T &b) {
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T c(std::move(a));
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a = std::move(b);
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b = std::move(c);
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}
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} // namespace std
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class B {
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public:
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B() = default;
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B(const B &) = default;
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B(B &&) = default;
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void operator=(B &&b) {
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return;
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}
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void foo() { return; }
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};
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class A {
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int i;
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double d;
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public:
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B b;
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A(int ii = 42, double dd = 1.0) : d(dd), i(ii), b(B()) {}
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void moveconstruct(A &&other) {
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std::swap(b, other.b);
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std::swap(d, other.d);
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std::swap(i, other.i);
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return;
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}
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static A get() {
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A v(12, 13);
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return v;
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}
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A(A *a) {
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moveconstruct(std::move(*a));
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}
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A(const A &other) : i(other.i), d(other.d), b(other.b) {}
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A(A &&other) : i(other.i), d(other.d), b(std::move(other.b)) { // expected-note {{'b' became 'moved-from' here}}
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}
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A(A &&other, char *k) {
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moveconstruct(std::move(other));
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}
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void operator=(A &&other) {
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moveconstruct(std::move(other));
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return;
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}
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int getI() { return i; }
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int foo() const;
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void bar() const;
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void reset();
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void destroy();
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void clear();
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bool empty() const;
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bool isEmpty() const;
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operator bool() const;
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};
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int bignum();
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void moveInsideFunctionCall(A a) {
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A b = std::move(a);
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}
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void leftRefCall(A &a) {
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a.foo();
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}
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void rightRefCall(A &&a) {
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a.foo();
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}
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void constCopyOrMoveCall(const A a) {
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a.foo();
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}
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void copyOrMoveCall(A a) {
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a.foo();
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}
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void simpleMoveCtorTest() {
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A a;
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A b;
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b = std::move(a); // expected-note {{'a' became 'moved-from' here}}
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a.foo(); // expected-warning {{Method call on a 'moved-from' object 'a'}} expected-note {{Method call on a 'moved-from' object 'a'}}
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}
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void simpleMoveAssignementTest() {
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A a;
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A b;
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b = std::move(a); // expected-note {{'a' became 'moved-from' here}}
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a.foo(); // expected-warning {{Method call on a 'moved-from' object 'a'}} expected-note {{Method call on a 'moved-from' object 'a'}}
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}
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void moveInInitListTest() {
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struct S {
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A a;
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};
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A a;
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S s{std::move(a)}; // expected-note {{'a' became 'moved-from' here}}
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a.foo(); // expected-warning {{Method call on a 'moved-from' object 'a'}} expected-note {{Method call on a 'moved-from' object 'a'}}
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}
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// Don't report a bug if the variable was assigned to in the meantime.
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void reinitializationTest(int i) {
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{
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A a;
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A b;
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b = std::move(a);
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a = A();
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a.foo();
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}
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{
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A a;
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if (i == 1) { // expected-note {{Assuming 'i' is not equal to 1}} expected-note {{Taking false branch}}
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// expected-note@-1 {{Assuming 'i' is not equal to 1}} expected-note@-1 {{Taking false branch}}
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A b;
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b = std::move(a);
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a = A();
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}
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if (i == 2) { // expected-note {{Assuming 'i' is not equal to 2}} expected-note {{Taking false branch}}
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//expected-note@-1 {{Assuming 'i' is not equal to 2}} expected-note@-1 {{Taking false branch}}
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a.foo(); // no-warning
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}
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}
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{
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A a;
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if (i == 1) { // expected-note {{Taking false branch}} expected-note {{Taking false branch}}
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std::move(a);
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}
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if (i == 2) { // expected-note {{Taking false branch}} expected-note {{Taking false branch}}
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a = A();
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a.foo();
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}
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}
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// The built-in assignment operator should also be recognized as a
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// reinitialization. (std::move() may be called on built-in types in template
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// code.)
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{
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int a1 = 1, a2 = 2;
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std::swap(a1, a2);
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}
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// A std::move() after the assignment makes the variable invalid again.
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{
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A a;
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A b;
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b = std::move(a);
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a = A();
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b = std::move(a); // expected-note {{'a' became 'moved-from' here}}
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a.foo(); // expected-warning {{Method call on a 'moved-from' object 'a'}} expected-note {{Method call on a 'moved-from' object 'a'}}
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}
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// If a path exist where we not reinitialize the variable we report a bug.
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{
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A a;
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A b;
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b = std::move(a); // expected-note {{'a' became 'moved-from' here}}
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if (i < 10) { // expected-note {{Assuming 'i' is >= 10}} expected-note {{Taking false branch}}
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a = A();
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}
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if (i > 5) { // expected-note {{Taking true branch}}
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a.foo(); // expected-warning {{Method call on a 'moved-from' object 'a'}} expected-note {{Method call on a 'moved-from' object 'a'}}
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}
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}
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}
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// Using decltype on an expression is not a use.
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void decltypeIsNotUseTest() {
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A a;
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// A b(std::move(a));
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decltype(a) other_a; // no-warning
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}
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void loopTest() {
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{
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A a;
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for (int i = 0; i < bignum(); i++) { // expected-note {{Loop condition is false. Execution jumps to the end of the function}}
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rightRefCall(std::move(a)); // no-warning
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}
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}
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{
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A a;
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for (int i = 0; i < 2; i++) { // expected-note {{Loop condition is true. Entering loop body}}
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//expected-note@-1 {{Loop condition is true. Entering loop body}}
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//expected-note@-2 {{Loop condition is false. Execution jumps to the end of the function}}
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rightRefCall(std::move(a)); // no-warning
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}
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}
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{
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A a;
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for (int i = 0; i < bignum(); i++) { // expected-note {{Loop condition is false. Execution jumps to the end of the function}}
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leftRefCall(a); // no-warning
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}
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}
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{
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A a;
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for (int i = 0; i < 2; i++) { // expected-note {{Loop condition is true. Entering loop body}}
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//expected-note@-1 {{Loop condition is true. Entering loop body}}
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//expected-note@-2 {{Loop condition is false. Execution jumps to the end of the function}}
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leftRefCall(a); // no-warning
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}
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}
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{
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A a;
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for (int i = 0; i < bignum(); i++) { // expected-note {{Loop condition is false. Execution jumps to the end of the function}}
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constCopyOrMoveCall(a); // no-warning
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}
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}
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{
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A a;
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for (int i = 0; i < 2; i++) { // expected-note {{Loop condition is true. Entering loop body}}
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//expected-note@-1 {{Loop condition is true. Entering loop body}}
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//expected-note@-2 {{Loop condition is false. Execution jumps to the end of the function}}
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constCopyOrMoveCall(a); // no-warning
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}
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}
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{
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A a;
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for (int i = 0; i < bignum(); i++) { // expected-note {{Loop condition is false. Execution jumps to the end of the function}}
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moveInsideFunctionCall(a); // no-warning
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}
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}
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{
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A a;
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for (int i = 0; i < 2; i++) { // expected-note {{Loop condition is true. Entering loop body}}
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//expected-note@-1 {{Loop condition is true. Entering loop body}}
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//expected-note@-2 {{Loop condition is false. Execution jumps to the end of the function}}
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moveInsideFunctionCall(a); // no-warning
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}
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}
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{
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A a;
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for (int i = 0; i < bignum(); i++) { // expected-note {{Loop condition is false. Execution jumps to the end of the function}}
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copyOrMoveCall(a); // no-warning
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}
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}
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{
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A a;
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for (int i = 0; i < 2; i++) { // expected-note {{Loop condition is true.}}
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//expected-note@-1 {{Loop condition is true. Entering loop body}}
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//expected-note@-2 {{Loop condition is false. Execution jumps to the end of the function}}
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copyOrMoveCall(a); // no-warning
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}
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}
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{
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A a;
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for (int i = 0; i < bignum(); i++) { // expected-note {{Loop condition is true. Entering loop body}} expected-note {{Loop condition is true. Entering loop body}}
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constCopyOrMoveCall(std::move(a)); // expected-warning {{Copying a 'moved-from' object 'a'}} expected-note {{Copying a 'moved-from' object 'a'}}
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// expected-note@-1 {{'a' became 'moved-from' here}}
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}
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}
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// Don't warn if we return after the move.
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{
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A a;
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for (int i = 0; i < 3; ++i) {
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a.bar();
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if (a.foo() > 0) {
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A b;
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b = std::move(a); // no-warning
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return;
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}
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}
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}
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}
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//report a usage of a moved-from object only at the first use
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void uniqueTest(bool cond) {
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A a(42, 42.0);
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A b;
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b = std::move(a); // expected-note {{'a' became 'moved-from' here}}
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if (cond) { // expected-note {{Assuming 'cond' is not equal to 0}} expected-note {{Taking true branch}}
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a.foo(); // expected-warning {{Method call on a 'moved-from' object 'a'}} expected-note {{Method call on a 'moved-from' object 'a'}}
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}
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if (cond) {
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a.bar(); // no-warning
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}
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a.bar(); // no-warning
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}
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void uniqueTest2() {
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A a;
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A a1 = std::move(a); // expected-note {{'a' became 'moved-from' here}}
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a.foo(); // expected-warning {{Method call on a 'moved-from' object 'a'}} expected-note {{Method call on a 'moved-from' object 'a'}}
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A a2 = std::move(a); // no-warning
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a.foo(); // no-warning
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}
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// There are exceptions where we assume in general that the method works fine
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//even on moved-from objects.
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void moveSafeFunctionsTest() {
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A a;
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A b = std::move(a); // expected-note {{'a' became 'moved-from' here}}
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a.empty(); // no-warning
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a.isEmpty(); // no-warning
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(void)a; // no-warning
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(bool)a; // expected-warning {{expression result unused}}
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a.foo(); // expected-warning {{Method call on a 'moved-from' object 'a'}} expected-note {{Method call on a 'moved-from' object 'a'}}
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}
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void moveStateResetFunctionsTest() {
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{
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A a;
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A b = std::move(a);
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a.reset(); // no-warning
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a.foo(); // no-warning
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}
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{
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A a;
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A b = std::move(a);
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a.destroy(); // no-warning
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a.foo(); // no-warning
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}
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{
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A a;
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A b = std::move(a);
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a.clear(); // no-warning
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a.foo(); // no-warning
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}
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}
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// Moves or uses that occur as part of template arguments.
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template <int>
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class ClassTemplate {
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public:
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void foo(A a);
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};
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template <int>
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void functionTemplate(A a);
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void templateArgIsNotUseTest() {
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{
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// A pattern like this occurs in the EXPECT_EQ and ASSERT_EQ macros in
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// Google Test.
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A a;
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ClassTemplate<sizeof(A(std::move(a)))>().foo(std::move(a)); // no-warning
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}
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{
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A a;
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functionTemplate<sizeof(A(std::move(a)))>(std::move(a)); // no-warning
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}
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}
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// Moves of global variables are not reported.
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A global_a;
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void globalVariablesTest() {
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std::move(global_a);
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global_a.foo(); // no-warning
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}
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// Moves of member variables.
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class memberVariablesTest {
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A a;
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static A static_a;
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void f() {
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A b;
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b = std::move(a); // expected-note {{'a' became 'moved-from' here}}
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a.foo(); // expected-warning {{Method call on a 'moved-from' object}} expected-note {{Method call on a 'moved-from' object 'a'}}
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b = std::move(static_a); // expected-note {{'static_a' became 'moved-from' here}}
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static_a.foo(); // expected-warning {{Method call on a 'moved-from' object 'static_a'}} expected-note {{Method call on a 'moved-from' object 'static_a'}}
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}
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};
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void PtrAndArrayTest() {
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A *Ptr = new A(1, 1.5);
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A Arr[10];
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Arr[2] = std::move(*Ptr); // expected-note {{Became 'moved-from' here}}
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(*Ptr).foo(); // expected-warning {{Method call on a 'moved-from' object}} expected-note {{Method call on a 'moved-from' object}}
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Ptr = &Arr[1];
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Arr[3] = std::move(Arr[1]); // expected-note {{Became 'moved-from' here}}
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Ptr->foo(); // expected-warning {{Method call on a 'moved-from' object}} expected-note {{Method call on a 'moved-from' object}}
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Arr[3] = std::move(Arr[2]); // expected-note {{Became 'moved-from' here}}
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Arr[2].foo(); // expected-warning {{Method call on a 'moved-from' object}} expected-note {{Method call on a 'moved-from' object}}
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Arr[2] = std::move(Arr[3]); // reinitialization
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Arr[2].foo(); // no-warning
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}
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void exclusiveConditionsTest(bool cond) {
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A a;
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if (cond) {
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A b;
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b = std::move(a);
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}
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if (!cond) {
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a.bar(); // no-warning
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}
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}
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void differentBranchesTest(int i) {
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// Don't warn if the use is in a different branch from the move.
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{
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A a;
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if (i > 0) { // expected-note {{Assuming 'i' is > 0}} expected-note {{Taking true branch}}
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A b;
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b = std::move(a);
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} else {
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a.foo(); // no-warning
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}
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}
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// Same thing, but with a ternary operator.
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{
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A a, b;
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i > 0 ? (void)(b = std::move(a)) : a.bar(); // no-warning // expected-note {{'?' condition is true}}
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}
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// A variation on the theme above.
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{
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A a;
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a.foo() > 0 ? a.foo() : A(std::move(a)).foo(); // expected-note {{Assuming the condition is false}} expected-note {{'?' condition is false}}
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}
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// Same thing, but with a switch statement.
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{
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A a, b;
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switch (i) { // expected-note {{Control jumps to 'case 1:' at line 448}}
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case 1:
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b = std::move(a); // no-warning
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break; // expected-note {{Execution jumps to the end of the function}}
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case 2:
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a.foo(); // no-warning
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break;
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}
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}
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// However, if there's a fallthrough, we do warn.
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{
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A a, b;
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switch (i) { // expected-note {{Control jumps to 'case 1:' at line 460}}
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case 1:
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b = std::move(a); // expected-note {{'a' became 'moved-from' here}}
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case 2:
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a.foo(); // expected-warning {{Method call on a 'moved-from' object}} expected-note {{Method call on a 'moved-from' object 'a'}}
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break;
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}
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}
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}
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void tempTest() {
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A a = A::get();
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A::get().foo(); // no-warning
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for (int i = 0; i < bignum(); i++) {
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A::get().foo(); // no-warning
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}
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}
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void interFunTest1(A &a) {
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a.bar(); // expected-warning {{Method call on a 'moved-from' object 'a'}} expected-note {{Method call on a 'moved-from' object 'a'}}
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}
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void interFunTest2() {
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A a;
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A b;
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b = std::move(a); // expected-note {{'a' became 'moved-from' here}}
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interFunTest1(a); // expected-note {{Calling 'interFunTest1'}}
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}
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void foobar(A a, int i);
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void foobar(int i, A a);
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void paramEvaluateOrderTest() {
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A a;
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foobar(std::move(a), a.getI()); // expected-warning {{Method call on a 'moved-from' object 'a'}} expected-note {{Method call on a 'moved-from' object 'a'}}
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// expected-note@-1 {{'a' became 'moved-from' here}}
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//FALSE NEGATIVE since parameters evaluate order is undefined
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foobar(a.getI(), std::move(a)); //no-warning
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}
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|
|
void not_known(A &a);
|
|
void not_known(A *a);
|
|
|
|
void regionAndPointerEscapeTest() {
|
|
{
|
|
A a;
|
|
A b;
|
|
b = std::move(a);
|
|
not_known(a);
|
|
a.foo(); //no-warning
|
|
}
|
|
{
|
|
A a;
|
|
A b;
|
|
b = std::move(a);
|
|
not_known(&a);
|
|
a.foo(); // no-warning
|
|
}
|
|
}
|
|
|
|
// A declaration statement containing multiple declarations sequences the
|
|
// initializer expressions.
|
|
void declarationSequenceTest() {
|
|
{
|
|
A a;
|
|
A a1 = a, a2 = std::move(a); // no-warning
|
|
}
|
|
{
|
|
A a;
|
|
A a1 = std::move(a), a2 = a; // expected-warning {{Copying a 'moved-from' object 'a'}} expected-note {{Copying a 'moved-from' object 'a'}}
|
|
// expected-note@-1 {{'a' became 'moved-from' here}}
|
|
}
|
|
}
|
|
|
|
// The logical operators && and || sequence their operands.
|
|
void logicalOperatorsSequenceTest() {
|
|
{
|
|
A a;
|
|
if (a.foo() > 0 && A(std::move(a)).foo() > 0) { // expected-note {{Assuming the condition is false}} expected-note {{Assuming the condition is false}}
|
|
// expected-note@-1 {{Left side of '&&' is false}} expected-note@-1 {{Left side of '&&' is false}}
|
|
//expected-note@-2 {{Taking false branch}} expected-note@-2 {{Taking false branch}}
|
|
A().bar();
|
|
}
|
|
}
|
|
// A variation: Negate the result of the && (which pushes the && further down
|
|
// into the AST).
|
|
{
|
|
A a;
|
|
if (!(a.foo() > 0 && A(std::move(a)).foo() > 0)) { // expected-note {{Assuming the condition is false}} expected-note {{Assuming the condition is false}}
|
|
// expected-note@-1 {{Left side of '&&' is false}} expected-note@-1 {{Left side of '&&' is false}}
|
|
// expected-note@-2 {{Taking true branch}} expected-note@-2 {{Taking true branch}}
|
|
A().bar();
|
|
}
|
|
}
|
|
{
|
|
A a;
|
|
if (A(std::move(a)).foo() > 0 && a.foo() > 0) { // expected-warning {{Method call on a 'moved-from' object 'a'}} expected-note {{Method call on a 'moved-from' object 'a'}}
|
|
// expected-note@-1 {{'a' became 'moved-from' here}} expected-note@-1 {{Assuming the condition is true}} expected-note@-1 {{Assuming the condition is false}}
|
|
// expected-note@-2 {{Left side of '&&' is false}} expected-note@-2 {{Left side of '&&' is true}}
|
|
// expected-note@-3 {{Taking false branch}}
|
|
A().bar();
|
|
}
|
|
}
|
|
{
|
|
A a;
|
|
if (a.foo() > 0 || A(std::move(a)).foo() > 0) { // expected-note {{Assuming the condition is true}}
|
|
//expected-note@-1 {{Left side of '||' is true}}
|
|
//expected-note@-2 {{Taking true branch}}
|
|
A().bar();
|
|
}
|
|
}
|
|
{
|
|
A a;
|
|
if (A(std::move(a)).foo() > 0 || a.foo() > 0) { // expected-warning {{Method call on a 'moved-from' object 'a'}} expected-note {{Method call on a 'moved-from' object 'a'}}
|
|
// expected-note@-1 {{'a' became 'moved-from' here}} expected-note@-1 {{Assuming the condition is false}} expected-note@-1 {{Left side of '||' is false}}
|
|
A().bar();
|
|
}
|
|
}
|
|
}
|
|
|
|
// A range-based for sequences the loop variable declaration before the body.
|
|
void forRangeSequencesTest() {
|
|
A v[2] = {A(), A()};
|
|
for (A &a : v) {
|
|
A b;
|
|
b = std::move(a); // no-warning
|
|
}
|
|
}
|
|
|
|
// If a variable is declared in an if statement, the declaration of the variable
|
|
// (which is treated like a reinitialization by the check) is sequenced before
|
|
// the evaluation of the condition (which constitutes a use).
|
|
void ifStmtSequencesDeclAndConditionTest() {
|
|
for (int i = 0; i < 3; ++i) {
|
|
if (A a = A()) {
|
|
A b;
|
|
b = std::move(a); // no-warning
|
|
}
|
|
}
|
|
}
|
|
|
|
void subRegionMoveTest() {
|
|
{
|
|
A a;
|
|
B b = std::move(a.b); // expected-note {{'b' became 'moved-from' here}}
|
|
a.b.foo(); // expected-warning {{Method call on a 'moved-from' object 'b'}} expected-note {{Method call on a 'moved-from' object 'b'}}
|
|
}
|
|
{
|
|
A a;
|
|
A a1 = std::move(a); // expected-note {{Calling move constructor for 'A'}} expected-note {{Returning from move constructor for 'A'}}
|
|
a.b.foo(); // expected-warning {{Method call on a 'moved-from' object 'b'}} expected-note {{Method call on a 'moved-from' object 'b'}}
|
|
}
|
|
// Don't report a misuse if any SuperRegion is already reported.
|
|
{
|
|
A a;
|
|
A a1 = std::move(a); // expected-note {{'a' became 'moved-from' here}}
|
|
a.foo(); // expected-warning {{Method call on a 'moved-from' object 'a'}} expected-note {{Method call on a 'moved-from' object 'a'}}
|
|
a.b.foo(); // no-warning
|
|
}
|
|
}
|